/**
 * Copyright (c) 2019-2021,  陈俊兵 (cjb6b.com@gmail.com)
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.ktjiaoyu.advance.lockupgrade;

import org.openjdk.jol.info.ClassLayout;

/**
 *
 * @packageName com.ktjiaoyu.advance.lockupgrade
 * @fileName BiasedLockTest.java
 * @author 陈俊兵 (cjb6b.com@gmail.com)
 * @createTime 2023/7/26 22:06
 * @lastModify 2023/7/26 22:06
 * @version 1.0.0
 */
public class BiasedLockTest {


    public static void main(String[] args) {
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        Object lock = new Object();
//        System.out.println(Integer.toHexString(lock.hashCode()));
        // 新创建的对象布局
        System.out.println(ClassLayout.parseInstance(lock).toPrintable());

        synchronized (lock){
//            // 锁定只有的对象布局
            System.out.println(ClassLayout.parseInstance(lock).toPrintable());
//            try {
//                Thread.sleep(100);
//                System.out.println("===================================================");
//                System.out.println(ClassLayout.parseInstance(lock).toPrintable());
//                System.out.println("===================================================");
//
//            } catch (InterruptedException e) {
//                e.printStackTrace();
//            }
//            // 重入时依然是偏向锁
            synchronized (lock){
                System.out.println(ClassLayout.parseInstance(lock).toPrintable());
            }
        }
//
//        // 不循环，竞争不激烈，则为轻量级锁，循环则升级为重量级锁
        for (int i = 0; i < 10; i++) {
            Thread t = new Thread(()->{
                try {
                    Thread.sleep(50);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                synchronized (lock){
                    try {
                        System.out.println("---------------------------");
                        System.out.println(ClassLayout.parseInstance(lock).toPrintable());
                        System.out.println("---------------------------");
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            });
            t.start();
        }
//
//




    }


}
